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LM5143QRWGRQ1 +BOM

Switching Controllers 3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller 40-VQFNP -40 to 150

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM5143QRWGRQ1
Datasheet:

LM5143QRWGRQ1 Datasheet (PDF)
Series:

Automotive, AEC-Q100
Output Type:

Transistor Driver
Function:

Step-Down
Output Configuration:

Positive
EDA/CAD Models:

Request Free CAD Models for LM5143QRWGRQ1

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LM5143QRWGRQ1 General Description

The LM5143-Q1 is a 65-V synchronous buck DC/DC controller for high-current single or dual outputs. The device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on-time of 65 ns gives large step-down ratios, enabling the direct conversion from 12-V, 24-V, or 48-Vautomotive inputs to low-voltage rails for reduced system complexity and solution cost. The LM5143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor for high accuracy. The 15-μA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM5143-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

Key Features

AEC-Q100 qualified for automotive applications:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature
Functional Safety-Capable
– Documentation available to aid functional safety
system design
Versatile synchronous buck DC/DC controller
– Wide input voltage range of 3.5 V to 65 V
– 1% accurate, fixed 3.3-V, 5-V, or adjustable
outputs from 0.6 V to 55 V
– 150°C maximum junction temperature
– Shutdown mode current: 4 µA typical
– No-load standby current: 15 µA typical
Two interleaved synchronous buck channels
– Dual-channel or single-output multiphase
– 65-ns tON(min) for high VIN/VOUT ratio
– 60-ns tOFF(min) for low dropout
Inherent protection features for robust design
– Hiccup-mode overcurrent protection
– Independent ENABLE and PGOOD functions
– VCC, VDDA, and gate-drive UVLO protection
– Thermal shutdown protection with hysteresis
Optimized for ultra-low EMI requirements
– Slew-rate controlled adaptive gate drivers
– Spread spectrum reduces peak emissions
– Optimized for CISPR 25 Class 5 requirements
Switching frequency from 100 kHz to 2.2 MHz
– SYNC in and SYNC out capability
– Selectable diode emulation or FPWM
VQFNP-40 pacakge with wettable flank pins
Create a custom design using the LM5143-Q1 with
WEBENCH® Power Designer

Application

• Automotive electronic systems
• Infotainment systems, instrument clusters
• Advanced driver assistance systems (ADAS)

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)DC DC Switching Controllers	Series	Automotive, AEC-Q100
Output Type	Transistor Driver	Function	Step-Down
Output Configuration	Positive	Topology	Buck
Number of Outputs	2	Output Phases	2
Voltage - Supply (Vcc/Vdd)	3.5V ~ 65V	Frequency - Switching	100kHz ~ 2.2MHz
Duty Cycle (Max)	100%	Synchronous Rectifier	Yes
Clock Sync	Yes	Serial Interfaces	-
Control Features	Current Limit, Dead Time Control, Enable, Frequency Control, Power Good, Soft Start	Operating Temperature	-40°C ~ 150°C (TJ)
Mounting Type	Surface Mount, Wettable Flank	Base Product Number	LM5143